1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * This header is used to share core functionality between the
4  * standalone connection tracking module, and the compatibility layer's use
5  * of connection tracking.
6  *
7  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
8  *	- generalize L3 protocol dependent part.
9  *
10  * Derived from include/linux/netfiter_ipv4/ip_conntrack_core.h
11  */
12 
13 #ifndef _NF_CONNTRACK_CORE_H
14 #define _NF_CONNTRACK_CORE_H
15 
16 #include <linux/netfilter.h>
17 #include <net/netfilter/nf_conntrack.h>
18 #include <net/netfilter/nf_conntrack_ecache.h>
19 #include <net/netfilter/nf_conntrack_l4proto.h>
20 
21 /* This header is used to share core functionality between the
22    standalone connection tracking module, and the compatibility layer's use
23    of connection tracking. */
24 
25 unsigned int nf_conntrack_in(struct sk_buff *skb,
26 			     const struct nf_hook_state *state);
27 
28 int nf_conntrack_init_net(struct net *net);
29 void nf_conntrack_cleanup_net(struct net *net);
30 void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list);
31 
32 void nf_conntrack_proto_pernet_init(struct net *net);
33 
34 int nf_conntrack_proto_init(void);
35 void nf_conntrack_proto_fini(void);
36 
37 int nf_conntrack_init_start(void);
38 void nf_conntrack_cleanup_start(void);
39 
40 void nf_conntrack_init_end(void);
41 void nf_conntrack_cleanup_end(void);
42 
43 bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
44 			const struct nf_conntrack_tuple *orig);
45 
46 /* Find a connection corresponding to a tuple. */
47 struct nf_conntrack_tuple_hash *
48 nf_conntrack_find_get(struct net *net,
49 		      const struct nf_conntrack_zone *zone,
50 		      const struct nf_conntrack_tuple *tuple);
51 
52 int __nf_conntrack_confirm(struct sk_buff *skb);
53 
54 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
nf_conntrack_confirm(struct sk_buff * skb)55 static inline int nf_conntrack_confirm(struct sk_buff *skb)
56 {
57 	struct nf_conn *ct = (struct nf_conn *)skb_nfct(skb);
58 	int ret = NF_ACCEPT;
59 
60 	if (ct) {
61 		if (!nf_ct_is_confirmed(ct)) {
62 			ret = __nf_conntrack_confirm(skb);
63 
64 			if (ret == NF_ACCEPT)
65 				ct = (struct nf_conn *)skb_nfct(skb);
66 		}
67 
68 		if (ret == NF_ACCEPT && nf_ct_ecache_exist(ct))
69 			nf_ct_deliver_cached_events(ct);
70 	}
71 	return ret;
72 }
73 
74 unsigned int nf_confirm(struct sk_buff *skb, unsigned int protoff,
75 			struct nf_conn *ct, enum ip_conntrack_info ctinfo);
76 
77 void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
78 		 const struct nf_conntrack_l4proto *proto);
79 
80 #define CONNTRACK_LOCKS 1024
81 
82 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
83 void nf_conntrack_lock(spinlock_t *lock);
84 
85 extern spinlock_t nf_conntrack_expect_lock;
86 
87 /* ctnetlink code shared by both ctnetlink and nf_conntrack_bpf */
88 
__nf_ct_set_timeout(struct nf_conn * ct,u64 timeout)89 static inline void __nf_ct_set_timeout(struct nf_conn *ct, u64 timeout)
90 {
91 	if (timeout > INT_MAX)
92 		timeout = INT_MAX;
93 	WRITE_ONCE(ct->timeout, nfct_time_stamp + (u32)timeout);
94 }
95 
96 int __nf_ct_change_timeout(struct nf_conn *ct, u64 cta_timeout);
97 void __nf_ct_change_status(struct nf_conn *ct, unsigned long on, unsigned long off);
98 int nf_ct_change_status_common(struct nf_conn *ct, unsigned int status);
99 
100 #endif /* _NF_CONNTRACK_CORE_H */
101